Upon a Fourth Monubromphenol. \'.\ 



cent., and Br., 4G.24 per cent.) According to this, the body 

 is actually a monobromphenol. It must be specially mentioned 

 that combustion takes place only with difficulty, in conse- 

 quence of which, a little tube drawn to a point is not available. 

 It is necessary to mix carefully the liquid substance with the 

 chromate of lead itself, and afterwards to burn it by means of 

 oxygen. The boiling-point of the new bromphenol is according 

 to the above, [230°], the same in fact as that of the p — brom- 

 phenol ; but it differs from this physically, as it cannot be solidi- 

 fied at a temperature of — 10° to — 12°, while para-bromphenol 

 is a solid body, melting at 64°. It is, moreover, nothing new 

 that bodies chemically different manifest the same boiling-points. 

 This is, for instance, the case with the toluidines as well as the 

 isomeric chlorphenyloic.oils,* and an example of the same melt- 

 ing-point of two isomeres is found in the dinitro-toluidmes.f 

 Moreover, the boiling-points of meta- and para-bromphenol (see 

 above) differ only two degrees — a difference that cannot be of 

 any consequence. 



In the following I shall, however, describe the behavior of the 

 fourth monobromphenol towards nitric acid, which is entirely 

 different from that of p — bromphenol (which is here the first 

 point in question), as well as from that of the other isomeres. 



]S t itro-compou;n"ds of the Fourth Bromphexol. 



As above already briefly mentioned, KornerJ obtained a mono- 

 brom-mononitrophenol from p — bromphenol, which proved to 

 be identical with that obtained by Brunck§ by tho action of 

 bromine upon nitro-phenol. It melted at 88°. From the same 

 bromphenol, the former prepared — by using more nitric acid — 1| 

 a monobrom-dinitro-phenol of the melting-point 75.6°. By 

 means of the bromphenol obtained by Hiibner and Brunken,*[ 



* Jahresb. d. Chem., 1879, 349 ; 1880, 621 



f The same, 1881, 543. 



% The same, 1875, 336. 



£ The same, 1867. 618. 



|| The same, 1875, 336. 



f The same, 1873, 409. etc. 



